CLDN18 and gastric cancer: The only recurrent genomic rearrangement involving interchromosomal translocation between claudin-18 and Rho GTPase activating protein 26 (CLDN18-ARHGAP26) was found in the genomically stable (GS) subtype of gastric cancer; this alteration is also enriched in the diffuse type and mutually exclusive with RHOA mutations.